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Interesting interview! Having lived for about a year in Pakistan before, I can definitely relate to some of the issues Mughal rises.

About the polio-sanitation link:
This is fairly well established, for a quick overview this should do:
www.polioeradication.org/Polioandprevention.aspx
There are even some that think improved WASH had an higher effect on polio eradication in most of the world than the vaccine has.
An interesting recent emerging topic is that bad sanitation (through environmental enteropathy and premature immune-system aging) also lowers the efficiency of child vaccination and thus has also indirectly an effect on the persistence of polio in some countries.